8) Which of the following actions is caused by skeletal muscle:
a) constriction of blood vessels
b) heartbeat
c) dilation of pupil
d) eye movements

9) Which of the following does NOT occur in a muscle during contraction:
a) thick and thin filaments bind to each
other
b) muscle fibers stretch
c) thick and thin filaments "slide"
past each other
d) muscle fibers shorten

12) A single motor neuron may innervate as few as 3-5 fibers in muscles
of the:
a) upper arms
b) legs
c) eye
d) heart

13) When an action potential reaches the presynaptic terminal of the
motor neuron:
a) calcium is released inside of the muscle
fiber
b) acetylcholine is released into the synaptic
cleft
c) acetylcholinesterease is released into
the synaptic cleft
d) physical contact between the motor neuron
and the muscle fiber occurs

14) Lack of acetylcholinesterase in the synaptic cleft would result
in:
a) decrease acetylcholine production by the
motor neuron
b) relaxation of the muscle fiber
c) excessive, continuous stimulation of the
muscle fiber
d) inability of the motor neuron to stimulate
the muscle fiber

15) Curare, a toxin, blocks the acetylcholine receptors on muscle tissue.
This would result in:
a) increased stimulation of the muscle fiber
b) inability of the muscle to respond to
motor nerve stimulus
c) contraction of the muscle fiber
d) excessive contractions and convulsions

16) Training excersizes such as jogging, swimming and aerobics have
this effect on skeletal muscle tissue:
a) increase number of mitochondria per muscle
fiber
b) increase number of muscle fibers
c) increase number of motor units
d) increase number of skeletal muscles

19) Anabolic steroids have all these effects except:
a) builds muscle proteins
b) increases muscle strength
c) increases number of muscles in the body
d) can result in liver cancer and heart disease

20) Which of the following statements regarding aging and the muscular
system is true:
a) aging is associated with decreased myoglobin
production
b) the effects of aging can be nearly completely
reversed
c) satellite cells increase in aging causing
fibrosis
d) young persons have more adipose in muscles
compared to elderly persons

Answers:
1) Skeletal muscle is described by all of the following
EXCEPT:
a) striated
b) voluntary
c) multinucleate d) autorhythmic

8) Which of the following actions is caused by skeletal muscle:
a) constriction of blood vessels
b) heartbeat
c) dilation of pupil d) eye movements

9) Which of the following does NOT occur in a muscle during contraction:
a) thick and thin filaments bind to each
other b) muscle fibers stretch c) thick and thin filaments "slide"
past each other
d) muscle fibers shorten

12) A single motor neuron may innervate as few as 3-5 fibers in muscles
of the:
a) upper arms
b) legs c) eye d) heart

13) When an action potential reaches the presynaptic terminal of the
motor neuron:
a) calcium is released inside of the muscle
fiber b) acetylcholine is released into the
synaptic cleft c) acetylcholinesterease is released
into the synaptic cleft
d) physical contact between the motor neuron
and the muscle fiber occurs

14) Lack of acetylcholinesterase in the synaptic cleft would result
in:
a) decrease acetylcholine production by the
motor neuron
b) relaxation of the muscle fiber c) excessive, continuous stimulation of
the muscle fiber d) inability of the motor neuron to stimulate
the muscle fiber

15) Curare, a toxin, blocks the acetylcholine receptors on muscle tissue.
This would result in:
a) increased stimulation of the muscle fiber
b) inability of the muscle to respond
to motor nerve stimulus c) contraction of the muscle fiber
d) excessive contractions and convulsions

16) Training excersizes such as jogging, swimming and aerobics have
this effect on skeletal muscle tissue: a) increase number of mitochondria per
muscle fiber b) increase number of muscle fibers
c) increase number of motor units
d) increase number of skeletal muscles

19) Anabolic steroids have all these effects except:
a) builds muscle proteins
b) increases muscle strength c) increases number of muscles in the
body d) can result in liver cancer and heart
disease

20) Which of the following statements regarding aging and the muscular
system is true: a) aging is associated with decreased
myoglobin production b) the effects of aging can be nearly
completely reversed
c) satellite cells increase in aging causing
fibrosis
d) young persons have more adipose in muscles
compared to elderly persons